U.S. patent number 5,224,936 [Application Number 07/961,501] was granted by the patent office on 1993-07-06 for automatic self-protecting hypodermic needle assembly.
Invention is credited to Brian Gallagher.
United States Patent |
5,224,936 |
Gallagher |
July 6, 1993 |
Automatic self-protecting hypodermic needle assembly
Abstract
An automatic self-protecting hypodermic needle assembly
comprising a hypodermic syringe having a housing, a moveable
plunger in the housing, a medicant chamber formed between the
housing and the plunger, and a hollow needle extending from the
housing in communication with the medicant chamber. A needle guard
assembly is attached to the syringe housing and includes a guard
housing adjacent the needle, a protective cap removably attached to
the guard housing and an aperture through which the needle extends.
A propellant is located in the guard housing in communication with
the protective cap. When activated by an activating element, the
propellant expands from a liquid to a gas, applies a pressure to
the protective cap, and drives the protective cap along the length
of the needle until the cap extends beyond the tip of the needle
and the needle tip becomes embedded in the protective cap. Control
means are provided under the operation of the medical attendant
using the hypodermic syringe to automatically activate the
propellant upon completion of the use of the syringe, and to embed
the needle tip into the protective cap.
Inventors: |
Gallagher; Brian (Homewood,
IL) |
Family
ID: |
25504555 |
Appl.
No.: |
07/961,501 |
Filed: |
October 15, 1992 |
Current U.S.
Class: |
604/192; 604/110;
604/145; 604/198 |
Current CPC
Class: |
A61M
5/50 (20130101); A61M 5/326 (20130101); A61M
2005/325 (20130101) |
Current International
Class: |
A61M
5/32 (20060101); A61M 5/50 (20060101); A61M
005/32 () |
Field of
Search: |
;604/110,187,192,198,141-147,263,218 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Yasko; John D.
Attorney, Agent or Firm: Welsh & Katz, Ltd.
Claims
I claim:
1. An automatic self-protecting hypodermic needle assembly
comprising:
a hypodermic syringe including a housing, a moveable plunger in
said housing, a medicant chamber formed between said housing and
said plunger, and a hollow needle extending from said housing, said
hollow needle in communication with said medicant chamber and
having a tip at a distal end of said needle;
a needle guard assembly attached to said syringe housing, said
needle guard assembly including:
a guard housing disposed adjacent said needle;
protective cap means removeably attached to said guard housing,
said protective cap means having an aperture therethrough, said
needle extending through said aperture;
said guard housing having propellant means disposed therein in
communication with said protective cap means, said propellant means
includes a first chemical propellant means which, when activated,
expands and applies a pressure to said protective cap means;
activating means in selective communication with said propellant
means to selectively activate said first chemical propellant when
said activating means comes into contact with said first chemical
propellant means; and
control means in communication with said activating means and
actuated by depression of said plunger to activate said first
chemical propellant means and produce a pressure which dislodges
said protective cap means from said guard housing and moves said
protective cap means along the length of said needle until said
protective cap means engages the tip of said needle and said needle
tip becomes embedded in said protective cap means.
2. The automatic self-protecting hypodermic needle assembly of
claim 1 wherein said guard housing includes a propellant chamber in
which said first chemical propellant means is disposed, which first
chemical propellant means pressurizes said propellant chamber when
activated to apply said pressure and to dislodge said protective
cap means.
3. The automatic self-protecting hypodermic needle assembly of
claim 2 wherein said control means includes a bellows disposed on
said syringe housing such that a portion of said plunger actuates
said bellows when said plunger is depressed into said syringe
housing a predetermined amount.
4. The automatic self-protecting hypodermic needle assembly of
claim 3 including tube means communicating between said bellows and
said propellent chamber, said activating means including a second
chemical activator means disposed in said tube means which when
coming into contact with said first chemical propellant in said
propellant chamber causes a reaction with said first chemical
propellant resulting in said pressurization of said propellant
chamber and dislodging of said protective cap means.
5. The automatic self-protecting hypodermic needle assembly of
claim 4 including a dislodgable substance disposed in said tube
means separating said first chemical propellant means and said
second chemical activator means until said bellows is actuated by
said plunger.
6. The automatic self-protecting hypodermic needle assembly of
claim 4 wherein said one of said first chemical propellant means
and said second chemical activator means is selected from the group
consisting of a mixture of citric acid and sodium carbonate, a
mixture of hydrogen peroxide and manganese dioxide, and a mixture
of acetic acid and sodium bicarbonate.
7. The automatic self-protecting hypodermic needle assembly of
claim 6 wherein said second chemical activator means is water.
8. The automatic self-protecting hypodermic needle assembly of
claim 5 wherein said dislodgable substance is selected from the
group consisting of petroleum jelly and wax.
9. The automatic self-protecting hypodermic needle assembly of
claim 1 wherein said protective cap means includes flexible needle
sealing means therein, said flexible needle sealing means held in a
first position away from said aperture in said protective cap means
by said needle when said protective cap is attached to said guard
housing and when said protective cap advances along the length of
said needle;
said flexible needle sealing means movable to a second position
sealing said aperture in said cap means against reemergence of said
needle when said protective cap means advances beyond the tip of
said needle.
10. The automatic self-protecting hypodermic needle assembly of
claim 1 wherein said control means includes a rod extending from a
manually operated disc adjacent said plunger, said rod having an
end thereof adapted to engage a flange on said protective cap means
upon actuation of said control means to dislodge said protective
cap means from said guard housing causing communication between
said first chemical propellant means and said activating means.
11. The automatic self-protecting hypodermic needle assembly of
claim 1 wherein a first chamber and a second chamber are located
between said guard housing and said protective cap means, said
first chamber and second chamber being separated by flange means
extending between said first and second chambers, said first
chemical propellant means disposed in one of said first and second
chambers, said activating means disposed in the other of said first
and second chambers, said control means adapted to break said
flange means causing communication between said first chemical
propellant means and said activating means.
12. The automatic self-protecting hypodermic needle assembly of
claim 11 wherein said flange means includes a first portion
connected and extending downward from said guard housing and a
second portion connected to and extending upward from said
protective cap means, said first and second portions of said flange
means being in mating relationship to separate said first and
second chambers until said control means dislodges said protective
cap means.
Description
The present invention relates to protective devices for hypodermic
syringes to prevent the needle of the syringe from repuncturing the
skin of the patient or health care professional after the intended
use of the syringe, and more particularly to an automatically
operated needle guard assembly which embeds the syringe needle into
a protective cap to prevent repuncture after each use of the
needle.
BACKGROUND OF THE INVENTION
Because of the possibility of spreading infectious disease,
hypodermic needles used in the health care industry are generally
disposed of after a single use. The need to prevent repuncture with
used hypodermic needles has become of paramount importance in view
of the AIDS epidemic. Patients, doctors, nurses, lab personnel, and
hospital laundry workers have become accidentally infected with the
AIDS HIV virus by puncturing themselves with hypodermic needles
previously used on AIDS infected patients. Although provisions are
made for the safe disposal of hypodermic needles in the medical
workplace, the difficult and sometimes chaotic environment of some
medical situations can cause even the best trained medical
personnel to misplace a used hypodermic needle.
Because the hypodermic needle is frequently used during times of
high stress, it would be of great benefit to provide a needle that
automatically shields itself after a single use without the
necessity of any conscious effort or thought by the attendant using
the needle.
Many different protective cap-type, or sheath-type devices for
protecting hypodermic needles against accidental needle sticks have
been advanced. While many of these devices are workable, they
either require manual deployment of a protective cap or sheath,
(and thus a conscious effort by the attendant) or they involve a
mechanism that obstructs the attendant's view of the needle as it
is advanced into the patient's skin. Other shielding devices that
are available involve complex mechanisms which would be costly to
manufacture. U.S. Pat. No. 4,915,696 to Feimer, U.S. Pat. No.
4,725,267 to Vaillancourt, U.S. Pat. No. 4,986,819 to Sobel, U.S.
Pat. No. 4,892,521 to Laico, U.S. Pat. No. 4,846,809 to Sims U.S.
Pat. No. 4,943,284 to Erlich, U.S. Pat. No. 4,911,694 to Dolan, and
U.S. Pat. No. 5,015,240 to Soproni are representative of devices
which require manual deployment of a trigger, or of a protective
cap or sheath by the attendant. These devices do not address the
need for automatic actuation of the cap to eliminate the element of
human error in deployment of the protective device.
Some prior inventions obstruct the vision of a substantial portion
of the needle when entering the patient's skin, and require a
specific amount of insertion into the skin to effect the triggering
of the protective device, (e.g. U.S. Pat. No. 4,795,432 to Karczmer
and U.S. Pat. No. 5,059,180 to McLees). These type of devices would
be inconvenient to use and deploy, and possibly dangerous.
It is an object, therefore, of the present invention to provide a
needle tip protective guard for a hypodermic needle that operates
automatically and that requires no additional action by the
operator.
It is another object of the invention to provide a needle guard
having a short, unobtrusive profile in the retracted, inactivated
position.
It is a further object of the invention to provide a needle tip
guard which includes a propellent system for placing the guard,
which propellent system becomes activated when the operator presses
the plunger on the hypodermic syringe to complete the injection.
Thus, the act of using the syringe causes the guard to operate.
It is another object to provide a needle guard that will close
itself off to prohibit the needle from reemerging once it has been
enclosed by the guard.
Another object is to provide a needle guard that is made integral
with the needle, so that the needle and guard are mounted to the
syringe simultaneously.
A still further object of the invention is to provide such a guard
mechanism that is constructed of simple plastic parts to minimize
material and production costs.
SUMMARY OF THE INVENTION
These and other objects of the invention are achieved by a
mechanism that uses gas pressure produced by the combining of two
chemicals to propel a protective cap along the needle shaft and
over the needle tip. The two chemicals are combined when the
attendant pushes the syringe to inject medication into the patient,
and, in a first embodiment, simultaneously squeezes a small bellows
located under the plunger. The bellows pumps a liquid chemical
through a tube and into contact with another chemical located in a
chamber at the hub of the needle. In a second embodiment, the
attendant depresses a circular disc and push rod assembly
simultaneously with the syringe plunger to cause communication
between the two chemicals in the chamber. The chamber in both
embodiments is connected to a flexible sheath that is in an
initially collapsed configuration. A plastic cap with a small
aperture through which the needle protrudes is connected to the
other end of the flexible sheath. A slow progressive gas pressure
results from the chemical reaction in the chamber causing the
flexible sheath to elongate and push the protective cap down the
needle shaft and over into contact with the tip. The protective cap
contains a plastic wafer with a small moveable tab member in its
center that is elastically biased toward the center, but held aside
by the needle. When the needle tip is withdrawn from the aperture
in the cap, the moveable tab member returns to center, blocks the
aperture, and prohibits the needle from reemerging from the
protective cap.
Other objects and features of the invention will become apparent
from the following detailed description of the preferred
embodiments when taken in conjunction with the drawings wherein
reference to specific parts is made.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevation view of a hypodermic needle equipped with
the automatic needle guard.
FIG. 2 is a partial cross section elevation view of the needle
guard assembly of FIG. 1 before being attached to the syringe.
FIG. 3 is a side cross section view of the hypodermic needle with
the automatic needle guard ready to draw medication into the
syringe.
FIG. 4 is a side cross section view of the hypodermic needle with
the automatic needle guard, wherein the needle is ready to inject
medication into the patient.
FIG. 5 is a cut-away side view of the top portion of the needle
guard assembly of FIG. 2 showing the bellows pump.
FIG. 6 is a cut-away, cross section view of the bottom portion of
the needle guard assembly of FIG. 2, showing the hypodermic needle
and the automatic needle guard. I FIG. 7 illustrates the needle
guard of FIG. 6 fully expanded with the needle enclosed within the
protective cap.
FIG. 8 is a top view of the bellows pump and its mounting element,
taken along line 8--8 of FIG. 5.
FIGS. 9 & 10 are end views of the plastic wafer forming part of
the needle guard assembly, showing the position of the moveable
member before and after the needle is enclosed within the
protective cap.
FIG. 11 is an elevation view of an alternate embodiment of the
present invention.
FIG. 12 is an elevational cross section view of the embodiment of
FIG. 11 showing the needle guard assembly attached to the
syringe.
FIG. 13 is a detail, cross section view of the embodiment of FIG.
11 showing the hypodermic needle and the interior structure of the
automatic needle guard.
FIG. 14 is an elevation cross section view of the needle guard of
the embodiment of FIG. 11 shown in the fully extended position with
the needle enclosed within the protective cap.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
For the sake of brevity, like components shall have the same
designation throughout the description of the figures.
Referring to FIG. 1, a plastic needle guard chamber assembly 10 is
attached to the needle end of hypodermic syringe 12 by the twist-on
method used on conventional needles. A liquid carrying tube 16 is
made integrally with, and shown connected to a guard housing 11 at
one end, and at the other end tube 16 is connected to a bellows
type pump 14 located under the syringe plunger 17. The hypodermic
needle 20 is made integrally with the needle guard housing 11 and
is shown in a fully exposed position with a moveable protective cap
18 in an unactivated position.
In FIG. 2, the needle guard chamber assembly 10 described above is
shown in condition for attachment to the syringe 12. A conventional
needle 20 and internally threaded hub 22 are shown relative to the
other needle guard chamber assembly components. The protective cap
18 is shown secured to the needle guard housing 11 by a friction
hold created between flanges 23 of cap 18 and the inside of a
shallow socket 24 depending from housing 11. The cap 18 may also be
secured by adhesive, or other suitable means. The protective cap 18
has contained within it an expandable sheath 26 made of a resilient
material such as latex or plastic. The sheath 26 is connected to
the protective cap 18 at one end and to the needle guard chamber 11
at the other end.
In FIG. 3, the assembly depicted in FIG. 2 is shown connected to a
hypodermic syringe 12 which is ready to draw medication. The
syringe plunger 17, which can be freely rotated axially within the
syringe, is shown with ratchet type serration 28 along the length
of the syringe stem 30 and extending half way around the
circumference of stem 30. The bellows pump 14 is shown with a
molded step 31 which acts as a pawl in conjunction with the
serration 28 on the syringe plunger stem 30. Also on the syringe
stem 30 is a low profile, cantilevered radial extension 32 which
encircles 180 degrees of the stem opposite to the extension of the
serration 28. Extension 32 provides a bellows pump contact between
the bellows 14 and the stem 30. The serrations 28 allow for
retraction of the plunger when drawing medication from a vial, but
prohibit advancement of the plunger. After the attendant fills the
syringe, the plunger is rotated 180 degrees to simultaneously
disengage the serration 28 from the pawl 31 and to place the
extension 32 directly over the bellows pump 14.
In FIG. 4, the plunger 17 has been rotated 180 degrees from its
previous position shown in FIG. 3 and lifted upward, whereby the
device is ready to inject medication into the patient. As plunger
17 is lowered, the bellows pump conductor or extension 32 begins to
depress the bellows pump 14 in the final 1/8 to 1/4 inch of travel
as the syringe plunger 17 is pushed by the attendant to inject
medication through hollow tube 20. After injection, the bellows
pump 14 will have forced a quantity of liquid material or chemical
contained therein to travel into tube 16 and then into guard
housing 11, as will be described.
In FIGS. 5 & 8, the bellows pump 14 is shown with a rounded
bead 34 at its lower end which snaps into a mating groove 36 (shown
in FIG. 3) in the top of the syringe housing. These mating parts
provide for quick and simple snap-on mounting of the bellows pump
14 to the syringe 12. Also shown is the pawl 31 encircling 180
degrees of the inside of the bellows pump.
FIG. 6 shows the tube 16 connected to the guard housing 11. The
housing 11 includes a hollow portion 40 in which a first chemical
propellent is disposed. A second liquid chemical is disposed in
bellows pump 14 and tube 16. The first and second chemicals in
hollow portion 40 and tube 16, respectively, are reactants relative
to each other, whereby when the two chemicals come into contact, a
reaction results, producing a gaseous product of reaction and an
increase in the pressure in hollow portion 40 of housing 11. To
prevent premature contact of the two chemical reactants, a small
amount of viscous fluid 38 such as petroleum jelly or similar thick
material acts as a plug in tube 16 at its entrance to the housing
11. The gas producing reactants may be any compounds or combination
or solutions of compounds that when combined, will produce emission
of gas. Such compounds could be water plus a mixture of citric acid
and sodium carbonate, hydrogen peroxide and manganese dioxide,
acetic acid and sodium bicarbonate, or similar known materials.
The gas produced by combining the chemical reactants will cause an
increase in pressure within the hollow portion 40 of guard housing
11. This pressure acts upon the upper surface of protective cap 18,
dislodging the protective cap and flange 23 from socket 24, and
forcing the protective cap downward along the length of needle 20.
As shown in FIG. 7, expandable sheath 26 extends downward along
protective cap 18, forming an extension of pressurized chamber
portion 40, thereby maintaining the gaseous pressure against
protective cap 18.
FIG. 7 shows the sheath 26 fully expanded with the protective cap
18 moved to a position beyond the tip of the hypodermic needle 20.
Also shown in FIG. 7 is a thin wafer 42 lodged in protective cap
18. The wafer 42 includes a flexible tab 44 (FIGS. 9 & 10)
which, in one position covers the aperture 43 in the protective
cap. The tab 44 seals the aperture 43 in the protective cap 18 to
prevent the needle 20 from reemerging from the cap.
FIGS. 9 & 10 are detailed illustrations of the thin plastic
wafer 42, shown in FIG. 9 with the needle 20 holding the wafer's
moveable member 44 to the side. When protective cap 18 is extended
by gas pressure beyond the tip of needle 20, the needle is
withdrawn from the aperture 43 in the protective cap 18, the
moveable tab member 44 is allowed to return to center by its own
resiliency (as shown in FIG. 10) and the tab blocks the needle 20
from reemerging from the protective cap 18 through aperture 43.
In operation, the medical professional attaches the needle guard
assembly 10 (as shown in FIG. 2) to the hypodermic syringe 12 by
threading the needle guard housing 11 onto the hypodermic syringe.
The bellows pump 14 is then snapped onto the top of the syringe and
held in place by a snap-fit of the rounded bead 34 on the bellows
14 and the mating groove 36 on the syringe 12. The attendant then
inserts the hypodermic needle 20 into a vial of medication, and
lifts the plunger 17 until the required amount of medication has
entered the syringe 12. The needle is then removed from the vial
and the plunger 17 is rotated 180 degrees to simultaneously
disengage the serration 28 from the pawl 31, and to place the
conductor extension 32 over the bellows pump 14.
The attendant then inserts the needle 20 into the patient's skin
and presses the plunger 17 to inject the medication. In the final
1/8 to 1/4 inch of travel of the plunger 17, the conductor 32
compresses the bellows pump 14 and displaces a quantity of liquid
Chemical down through tube 16 and into chamber 40, dislodging
viscous liquid 38 whereby the first liquid in tube 16 comes into
contact with the second chemical in chamber 40. After completion of
the injection, the needle 20 is withdrawn from the patient as the
chemical reaction continues inside the chamber 40. A steadily
increasing pressure develops as the chemical reaction inside the
chamber 40 produces gas. The gas pressure causes the protective cap
18 to be propelled down the needle 20 and expandable sheath 26 to
elongate under the force of the gas pressure. When the protective
cap 18 has moved completely over the end of the needle 20, the tab
member 44 (FIG. 10) closes off the aperture 43 in the protective
cap 18 to prevent reemergence of the hypodermic needle 20 through
the aperture 43.
The needle guard assembly 10' constructed according to a second
embodiment of the invention will now be described with reference to
FIGS. 11-14. In this embodiment, the mechanism for triggering the
chemical reaction to propel the protective cap 18 is different from
the embodiment of FIGS. 1-10.
In FIG. 11 the hypodermic syringe 12 is shown connected to the
needle guard assembly housing 45. A push rod 46 slidably extends
through a bracket 60 which is mounted alongside of the syringe 12.
The push rod 46 has a circular disc 47 at the upper end that
extends over the top of the syringe plunger 17.
FIG. 12 shows the device of the second embodiment in condition to
inject medication into the patient. The attendant presses the
circular disc 47 and the syringe plunger 17 downward simultaneously
to administer the injection. The end 48 of push rod 46 moves
downward and contacts a flange 49 on the protective cap 18 in the
final 1/8 inch of travel of the syringe plunger 17. In this
embodiment, the side of the protective cap 18 extends upward
alongside hub 22, and is releasably and frictionally held to hub 22
at 61 (FIG. 13). When the injection is completed, the push rod will
have advanced the protective cap 18 approximately 1/8 of an inch
downward and the chemicals located within the protective cap 18, as
will be described, will combine and produce gas, applying a
downward pressure on cap 18.
FIG. 13 is a detail view of the interior of protective cap 18, and
shows the threaded hub 22 for mounting the needle 20 to the syringe
12. The expandable sheath 26 is shown connected to the hub 22 at
the top and to the protective cap 18 at the bottom. Two chemical
reactants 50 and 53 are located within the protective cap 18, and
are initially separated by a cylindrically shaped flange 51 that
extends downwardly from hub 22. Flange 51 is in mating contact with
a corresponding flange 52 which extends upward from the bottom
interior of protective cap 18. When the protective cap 18 has been
advanced slightly by the downward movement of push rod 46 after
completion of the injection, the mating flanges 51 and 52 separate
to allow communication between the two chemical reactants 50 and
53. The gas produced by the chemical reaction will cause an
increase in pressure inside the protective cap 18, and an
elongation of the expandable sheath 26 along with downward movement
of protective cap 18. FIG. 14 shows the sheath 26 fully expanded
with the protective cap 18 covering the tip of the hypodermic
needle 20. Also shown is tab 42 covering the aperture 43 in the
protective cap as described in conjunction with the first
embodiment. As in the first embodiment, the tab 42 prevents the
needle 20 from reemerging from the protective cap 18.
In operation, the medical professional attaches the needle guard
assembly 45 to the hypodermic syringe 12 by threading the needle
guard chamber hub 22 onto the mating thread on the hypodermic
syringe. The attendant then inserts the hypodermic needle 20 into a
vial of medication and retracts the plunger 17 until the required
amount of medication has entered the syringe 12. The needle 20 is
then removed from the vial, and the syringe is ready to inject
medication. The attendant inserts the needle 20 into the patient's
skin and presses downward on the circular disc 47 and the syringe
plunger 17 simultaneously. In the final 1/8 to 1/4 inch of travel
of the syringe plunger 17, the push rod 46, which is connected to
the circular disc 47, contacts flange 49 on the protective cap 18,
and moves the protective cap a short distance down the needle 20.
The short displacement of the protective cap 18 separates flanges
51 and 52 (FIG. 13), which allows communication between chemicals
50 and 53. This starts a chemical reaction within the protective
cap 18 just as the injection is completed and the needle is removed
from the patient's skin.
The chemical reaction described above is started when the
protective cap 18 is displaced a short distance causing separation
of the downward extending flange 51 from a mating upwardly
extending flange 52. This separation of flanges 51 and 52 causes
the liquid chemical reactant 53 to come into contact with the other
chemical reactant 50. A few seconds after the injection is
completed, an increasing gas pressure develops inside the
protective cap 18 as the chemical reaction progresses. The gas
causes the expandable sheath 26 to elongate and the protective cap
18 to move down the needle 20. When the protective cap 18 has moved
completely over the end of the needle 20, the tab member 42 closes
off the aperture 43 in the protective cap 18 to prevent reemergence
of the needle 20.
Specific embodiments of the novel Automatic Self-Protecting
Hypodermic Needle Assembly according to the present invention have
been described for the purpose of illustrating the manner in which
the invention may be made and used. It should be understood that
implementation of other variations and modifications of the
invention in its various aspects will be apparent to those skilled
in the art and that the invention is not limited by the specific
embodiments described. It is therefore contemplated to cover by the
present invention any and all modifications, variations, or
equivalents that fall within the true spirit and scope of the basic
underlying principles encompassed by the claims set forth
hereinbelow.
* * * * *